Germanicus Julius Caesar (24 May 15 BC – 10 October AD 19) was a Roman general and politician most famously known for his campaigns against Arminius in Germania. The son of Nero Claudius Drusus and Antonia the Younger, Germanicus was born into an influential branch of the patrician gens Claudia. The agnomen Germanicus was added to his full name in 9 BC when it was posthumously awarded to his father in honor of his victories in Germania. In AD 4 he was adopted by his paternal uncle Tiberius, himself the stepson and heir of Germanicus' great-uncle Augustus; ten years later, Tiberius succeeded Augustus as Roman emperor. As a result of his adoption, Germanicus became an official member of the gens Julia, another prominent family, to which he was related on his mother's side. His connection to the Julii Caesares was further consolidated through a marriage between him and Agrippina the Elder, a granddaughter of Augustus. He was also the father of Caligula, the maternal grandfather of Nero, and the older brother of Claudius.
During the reign of Augustus, Germanicus enjoyed an accelerated political career, entering the office of quaestor five years before the legal age in AD 7. He held that office until AD 9 where he was made praetor after the Pannonian war, and was elected consul for the first time in AD 12. The year after, he was made proconsul of Germania Inferior, Germania Superior, and all of Gaul. From there he commanded eight legions, about one-third of the entire Roman army at the time, which he led against the Germanic tribes in his campaigns from AD 14 to 16. He avenged the Roman Empire's defeat in the Teutoburg Forest and retrieved two of the three legionary eagles that had been lost during the battle. In AD 17, he returned to Rome, where he received a triumph before leaving to reorganize the provinces of Asia Minor, whereby he incorporated the provinces of Cappadocia and Commagene in AD 18.
While in the eastern provinces, Germanicus came into conflict with the governor of Syria, Gnaeus Calpurnius Piso. During their feud, Germanicus became ill in Antioch and died on 10 October AD 19. His death has been attributed to poison by ancient sources, but that was never proven. As a famous general, he was widely popular and regarded as the ideal Roman long after his death. To the Roman people, Germanicus was the Roman equivalent of Alexander the Great due to the nature of his death at a young age, his virtuous character, his dashing physique, and his military renown.
Germanicus's praenomen (personal name) at birth is unknown, but he was probably named Nero Claudius Drusus after his father (conventionally called "Drusus"), or possibly Tiberius Claudius Nero after his paternal uncle. He took the agnomen (nickname) "Germanicus", awarded posthumously to his father in honor of his victories in Germania, at which point he nominally became head of the family in 9 BC. By AD 4 his uncle Tiberius adopted Germanicus as his son and heir. As a result, Germanicus was adopted out of the gens Claudia and into that of the gens Julia. In accordance with Roman naming conventions, he adopted the name "Julius Caesar" while retaining his agnomen, becoming Germanicus Julius Caesar. Upon Germanicus' adoption into the Julii, his brother Claudius became the sole legal representative of his father, inheriting the agnomen "Germanicus" as the new head of the family.
Germanicus was born in Rome on 24 May 15 BC to Nero Claudius Drusus and Antonia Minor and had two younger siblings: a sister, Livilla, and a brother, Claudius. His paternal grandmother was Livia, who had divorced his grandfather Tiberius Claudius Nero around 24 years before Germanicus' birth. Livia's second marriage was to the Roman emperor Augustus. His maternal grandparents were the triumvir Mark Antony and Augustus' sister Octavia Minor. Germanicus was a key figure in the Julio-Claudian dynasty of the early Roman Empire. Tiberius, Germanicus' uncle, became the second Roman emperor and would be succeeded by Germanicus' son Gaius. Germanicus was also the brother of the fourth emperor, Claudius, and the grandfather of the fifth emperor, Nero.
When Augustus' chosen successor, Gaius Caesar, died in AD 4, he briefly considered Germanicus as his heir. His wife Livia persuaded him to choose his stepson Tiberius instead. As part of the succession arrangements, Augustus adopted Tiberius on 26 June AD 4, but first required him to adopt Germanicus, thus placing him next in the line of succession after Tiberius. Germanicus married Augustus' granddaughter, Agrippina the Elder, probably the next year, to further strengthen his ties to the imperial family. The couple had nine children: Nero Julius Caesar; Drusus Caesar; Tiberius Julius Caesar (not to be confused with emperor Tiberius); a child of unknown name (normally referred to as Ignotus); Gaius the Elder; Gaius the Younger (the future emperor "Caligula"); Agrippina the Younger (the future empress); Julia Drusilla; and Julia Livilla. Only six of his children came of age; Tiberius and the Ignotus died as infants, and Gaius the Elder in his early childhood.
Germanicus became a quaestor in AD 7, four years before the legal age of 25. He was sent to Illyricum the same year to help Tiberius suppress a rebellion by the Pannonians and Dalmatians. He brought with him an army of levied citizens and former slaves to reinforce Tiberius at Siscia, his base of operations in Illyricum. Towards the end of the year, additional reinforcements arrived; three legions from Moesia commanded by Aulus Caecina Severus, and two legions with Thracian cavalry and auxiliary troops from Anatolia commanded by Silvanus.
By the time Germanicus had arrived in Pannonia, the rebels had resorted to raiding from the mountain fortresses to which they had withdrawn. Because the Roman legions were not so effective at countering this tactic, Tiberius deployed his auxiliary forces and divided his army into small detachments, allowing them to cover more ground and conduct a war of attrition against the rebels in their strong defensive positions. The Romans also began to drive the rebels out of the countryside, offering amnesty to those tribes that would lay down their arms, and implemented a scorched earth policy in an effort to starve the enemy out. During this period, Germanicus' detachments were in action against the Mazaei, whom he defeated.
The rebel position in Pannonia collapsed in AD 8 when one of their commanders, Bato the Breucian, surrendered their leader Pinnes to the Romans and laid down his arms in return for amnesty. This was nullified when Bato the Breucian was defeated in battle and subsequently executed by his former ally Bato the Daesitiate, but this left the Pannonians divided against each other, and the Romans were able to subdue the Breuci without battle. The pacification of the Breuci, with their large population and resources, was a significant victory for the Romans, who would be reinforced by eight cohorts of Breuci auxiliaries towards the end of the war. Bato the Daesitiate withdrew from Pannonia to Dalmatia, where he occupied the mountains of Bosnia and began conducting counter-attacks, most likely against the indigenous people who sided with the Romans. Later in the year, Tiberius left Lepidus in command of Siscia and Silvanus at Sirmium.
Roman forces took the initiative in AD 9, and pushed into Dalmatia. Tiberius divided his forces into three divisions: one under Silvanus, which advanced south-east from Sirmium; another commanded by Lepidus, which advanced north-west along the Una Valley from Siscia toward Burnum; and the third led by Tiberius and Germanicus in the Dalmatian hinterland. The divisions under Lepidus and Silvanus practically exterminated the Perustae and Daesitiate in their mountain strongholds. Roman forces captured many cities, and those commanded by Germanicus took Raetinum, near Seretium (although it was destroyed in a fire set by the rebels during the siege), Splonum (in modern-day northern Montenegro) and Seretium itself (in modern-day western Bosnia). The Roman forces under Tiberius and Germanicus pursued Bato to the fortress of Andretium near Salona, to which they laid siege. When it became clear Bato would not surrender, Tiberius assaulted the fortress and captured him. While Tiberius negotiated the terms of surrender, Germanicus was sent on a punitive expedition across the surrounding territory, during which he forced the surrender of the fortified town of Arduba and surrounding towns. He then sent a deputy to subdue the remaining districts and returned to Tiberius.